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Bradley and Brendan g18 19 main

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  • 1.
    • Dedham Mill, Essex 1820 by John Constable.
    • Our photos of the River Stour are taken looking down the river to the left from the bridge in the photo
  • 2. River Stour, Dedham, Essex
    • We think that this river is at the Lower Course stage of the river because of the following points:-
    • *Flat and wide floodplains. We often see from our house the fields around the river flooded in winter as this happens quite often.
    • * Gentle valleys and hills along with the wide plains are seen in the photo below
  • 3. The river has become wider with flooding and the extra water from the melted snow – you can see in the photo below how the river is now overflowing up and around the trees
  • 4. More reasons that this is at the Lower Course stage
    • Other reason is that this stage the river is gently meandering
    • You can also see this in the map below
  • 5. More Reasons - Splits and Channels
    • Closer look at the shallow split
    • The river running through Dedham also splits in a number of places where sand, rocks and dirt have built up. In the photo below you can see that the main river is on the right with a split channel on the left
  • 6. River Speed
    • The water is flowing quite slowly here even though it was a windy day when this research was taken.
    • We measured out 10 steps and it took the floating orange 74 seconds to float this distance.
    • 10m divided by 74seconds = 0.135 meter per second river speed
  • 7. The river in Dedham does not have a Ox Bow but below is an aerial photo of the River Stour in Higham – about 2.5 miles from Dedham showing an Ox Bow in the river – another indication of the Lower Course stage
    • With this Ox Bow you can see the lake in the middle and it will submerge with the meander in time
  • 8. Estuary in Mistley
  • 9. Estuary Features
    • Another reason we think that the River Stour in Dedham is a Lower Course is that 5 miles away in Mistley is the estuary of this river
    • We visited this part of the river the next day after taking the photos in Dedham.
    • Judging by the photos we have taken we have proof that this is a estuary.
  • 10. Feature – width & tides
    • Here you can see how much wider the river is to the one in Dedham –
    • This part of the river has tides – showing the closeness to the sea
  • 11. Sediment and rocks are deposited here, and because the river is not flowing quickly is stays here and does not go any further
  • 12. From the photo below you can see the low plains and wide river at Mistley
    • From the map you can see the river from Dedham to Mistley and further to the sea at Harwich
  • 13. Conclusions on which Course the River Stour, Dedham is
    • We believe that the river we have looked at is at the Lower Course stage because
    • Wide floodplains
    • Gentle hills, low valleys
    • Slow river speed – water mainly flat with small ripples
    • Meandering river
    • Splits and channels in the river from deposits
    • Flooded banks
    • Ox Bow formed just before Dedham (2.5 miles away)
    • Estuary close by after Dedham at Mistley (5 miles away)